TL;DR: "Cape" refers to a historical colour classification, not a cutting style — diamonds with a pale yellowish tint, originally associated with stones found near South Africa's Cape Colony in the 19th century. The term predates the modern GIA D-to-Z colour scale and is still occasionally used informally in the antique diamond trade, but doesn't map to a single specific certificate grade today.
Why "Cape" Is a Colour Term, Not a Cut
This is worth clarifying upfront, since the name sounds like it could describe a shape or faceting style the way "Old Mine" or "Peruzzi" do — it doesn't. Cape refers specifically to body colour: a pale, often slightly greenish-yellow tint historically associated with diamonds mined near South Africa's Cape Colony from the 1870s onward, when major diamond discoveries there began supplying much of the world's market.
Where the Term Came From
As South African production scaled up in the late 19th century, "Cape" became informal trade shorthand for diamonds showing this specific pale yellow-tinted colour range, distinguishing them from the more colourless stones prized at the top of the market. The term predates the standardised GIA D-to-Z colour scale, which wasn't developed until the mid-20th century.
How It Relates to Modern Grading
"Cape" doesn't correspond to one single grade on the modern scale — it historically covered a range roughly corresponding to what would now be graded somewhere in the lower colourless to near-colourless range (broadly, grades in the K to M territory, though exact historical usage varied). When you encounter the term today, usually in the context of antique stones or older trade documentation, it's worth asking for the actual modern GIA or IGI grade rather than relying on the historical label alone.
Why This Matters When Looking at Antique Stones
If you're researching or buying a genuinely antique diamond described using historical terminology like this, always ask for current, independent certification alongside any historical description — the old trade language is useful context but isn't a substitute for a modern, verifiable grading report.
Sourcing and Grading Antique Stones at À Vie Diamonds
We always provide current GIA or IGI certification for any stone we source, regardless of its historical origin or how it might be described in older trade terminology. Get in touch if you're researching a specific antique stone.
Related Reading
Frequently Asked Questions
Is Cape a type of diamond cut? No — it's a historical colour classification, referring to a pale yellowish tint originally associated with diamonds mined near South Africa's Cape Colony in the 19th century, not a cutting or faceting style.
What modern colour grade does Cape correspond to? There's no single exact equivalent, since the term predates the standardised GIA scale, but it broadly covered stones in the lower colourless to near-colourless range. Always ask for a current, independent grading certificate rather than relying on the historical term alone.
Last reviewed: July 2026 · À Vie Diamonds